Great Western Electrification Packages 9 & 10
Hyder Consulting (UK) Ltd
HOCHTIEF demolished and replaced eight bridges along the Great Western Mainline to create clearance for Overhead Line Electrification (OLE). Part of Network Rail’s £3bn Great Western Electrification programme (GWEp), the works also included road construction, utilities diversions and careful management of the road-railway interface.
- 8 bridge reconstructions
- Temporary works
- Significant utilities diversion
- Road construction
We reviewed and rescheduled our works across all bridge sites to benefit the overall Great Western Electrification programme. This led us to change our possession plan for our first bridge reconstruction to allow other contractors to access the track at Christmas, avoiding delays. We also reduced rail possession times by carefully studying the works and implementing measures to avoid overrun, planning the works in 15-minute intervals to ensure that we completed each bridge replacement on time.
During rules of the route possessions, we installed temporary works to support the side arches, and we assembled the new precast concrete bridge sections offline. During disruptive possessions, we demolished the existing brick arches, using boards and mats to protect the tracks. We strengthened the existing abutments, lifted in the new bridge structure, then removed the protection from the tracks before handing them back into service.
We sequenced construction to reduce road closures and diversion durations, and we built a1.1km link road to avoid a 34-mile diversion. We also reused 200t of stone and 6000 bricks from the demolition, saving over 5t CO2e. Similarly, disposing of 900t of hardcore to a local farmer and moving 67k tonnes of aggregate by rail saved 285t CO2e.
Each bridge was successfully replaced on time and we won a Network Rail Star Award 2016 as well as a 2015 Green Apple Award.